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T8 and T12 tubes are also available in other lengths such as 8-ft tubes, but 4-ft lengths remain the most common types.

T5 lamps come in a variety of lengths such as 1-ft, 2-ft and 3-ft versions and are commonly used in non-ceiling fixtures such as table lamps.

They are slightly shorter than four feet (45.8 inches). They are commonly designated T5HO (high output) and provide more brightness than their T8 counterparts.

T5 4-ft: Four-foot T5 fluorescent lamps are typically the most efficient, and some of the newest types of lamps introduced in the 2000's in the USA.

They are the same length as T8 lamps, but have a larger 1.5 inch lamp diameter.

T12 4-ft: Four-foot T12 fluorescent lamps are less efficient compared to T8 lamps.

They are 48 inches in length, and have a 1 inch lamp diameter.

T8 4-ft: Four-foot T8 fluorescent lamps are the most commonly used type today.

Over the years, fluorescent tube manufacturers developed many varieties of sizes and types. Therefore, it is important to understand the types of fluorescent tubes that were developed, so that the correct LED tube light can be retrofitted in place. 2) Fluorescent tubes sizes and LED tube light retrofittingīecause fluorescent fixtures are often mounted into ceilings and connected directly to mains electricity, they are relatively expensive and difficult to replace completely.Īs a result, it oftentimes makes the most economical sense to simply use the same fluorescent fixture, but replace the fluorescent tube with an LED tube light.